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“#Fish, seaweed inspire slippery surfaces for ships” An X-ray image of a loach’s mucus storage system, and a schematic diagram demonstrating how lubricant is secreted in the authors’ setup. Credit: Hyung Jin Sung Long-distance cargo ships lose a significant amount of energy due to fluid friction. Looking to the drag reduction mechanisms employed by aquatic…
“#Restoring the filtration efficiency of N95 masks after they have been cleaned” Schematic of the method to recharge decontaminated masks, and a comparison of their pristine, decontaminated and recharged filtration efficiencies. Credit: Tata Institute of Fundamental Research N95 masks are a critical part of the personal protective equipment used by front-line health care workers. These…
“#Poetry in motion: Engineers analyze the fluid physics of movement in marine snails” In the world’s oceans, billions of tiny marine snails (a form of plankton) commute daily between surface waters, where they feed at night, to depths of several hundred meters during the day to rest while avoiding predators. Marine snails play an important…
“#Using a public restroom? Mask up!” Discrete particle distribution of urinal flushing. Credit: Ji-Xiang Wang Think you don’t need to worry about COVID-19 while using a public restroom? A group of researchers from Yangzhou University in China recently reported that flushing public restroom toilets can release clouds of virus-laden aerosols for you to potentially inhale….
“#Humid air can extend lifetime of virus-laden aerosol droplets” Color map showing the amount of time a free-falling 100-micron droplet at an initial height of 1.6 meters is affected by temperature and humidity. For relative humidities (RH) and temperatures (T) below the yellow arc, the droplet will fall to the ground in the number of…
“#Researchers capture footage of fluid behaving like a solid” Three consecutive frames from the high-speed camera as air is forced into the corn starch suspension. Abrupt shear thickening makes it fracture like a solid. The suspension “melts” back to a liquid once the fracture front has passed. Credit: IMPACT, Swansea University Swansea University researchers from…
“#Droplet spread from humans doesn’t always follow airflow” Left: Droplet paths from patient to extraction device: small, medium, and large droplets. Right: Maximum horizontal distance covered by exhaled water droplets for various droplet diameters: heavy vs. quiet breathing. The red dot indicates the global minimum in distance covered. In this case, the minimum is attained…
“#How to get rid of the coffee-stain effect” Credit: University of Twente The coffee-stain effect is a well-known effect in physics and daily life in which a dark-colored edge remains when a fluid containing particles evaporates. This is caused by an “avalanche” of particles moving to the outer edge, University of Twente scientists showed in…